Yes you can use the BB data plan on a iPhone...not sure about the 4 but I know it works on the 3G and 3Gs. You need to have the right MMS and Wap settings for Orange for it to work. I have used my 3G with my BB data plan and also plan to use it on my 3Gs when I unlock it. I switch between my BB and iPhone on TMo and use the BB data plan, you will need to jailbreak the iPhone to be able to change the settings btwPosted via BlackBerryForums.com Mobile